Optimalisasi Pengeboran Reservoar Tight Sand dan Shale Gas Pada Sub-Cekungan Jambi Melalui Estimasi Tekanan Pori Metode Drilling Efficiency Mechanical Specific Energy (DEMSE) dan Metode Bowers = Drilling Optimization of Tight Sands and Shale Gas Reservoir in Jambi Sub-Basin Based on Pore Pressure Estimation Using Drilling Efficiency Mechanical Specific Energy (DEMSE) and Bowers Methods